vibrating clutch

[Grant]

I'm nto clear on whether the vibration is:
a) during pedal travel
b) during engagement
c) once fully engaged
d) all/none of the above

It sounds as if it could be either 1) chatter, which is generally 
caused by a weak
pressure plate/diaphragm, or 2) irregularity on the clutch disk surface.

Since I've had experience with the 2nd only, let me address that.

I dont know the cause, but on my 1991 90q20v, at about 100-120k miles
(it was a long time ago), the clutch began to have some "grabbiness" 
upon
engagement, which could be come a chatter if you weren't especially 
careful,
nor quick.

Somehow, I surmised ("guessed") that it might be balled up clutch 
material
on the clutch face. Dont ask why, but I did.  i intentionally slipped 
the clutch
a few times, lightly, to clean it off. I typically engage with almost 
no slip, and
match revs once moving.

Fixed.  no noticeable wear.  2nd owner is still on that clutch at ~200k.
I drove it about a month ago.

YMMV, and probably will, but its one more random thought to put into 
your filter.

Grant

On Jan 15, 2006, at 12:00 PM, quattro-request at audifans.com wrote:

> From: TooManyAudis at aol.com
> Date: January 14, 2006 11:09:02 PM EST
> To: 200q20v at audifans.com, quattro at audifans.com
> Subject: Vibrating Clutch
>
>
> I just got bock home to Charleston, SC from a trip to Orlando in my 91 
>  200q.
>  No problems on the drive until....  I got back into the drivers  seat 
> after
> letting a friend drive for 250 miles or so.
>
> There was noticeable vibration in the clutch as I pulled back onto the 
>  road.
>  I didn't get the vibration each time I depressed the clutch, but  
> about 60%
> or so.  Sometimes just when I was releasing the clutch after  changing 
> gears,
> other times both on the down stroke and again on the up stroke,  and a 
> few
> times no vibration at all.
>
> Note, that this was not happening before my friend took the wheel -- I 
>  don't
> think he was the cause, just coincidence as he has owned a Porsche 
> 911, a
> Scirocco and several other manual tranny cars in the past.  I simply am
> deflecting blame from myself.
>
> Any thoughts?
>
> -- Tom
>
> Isle of Palms, SC
> 91 200q
> 88 80q